Organic waste being the greatest contributor of the pollution need proper management to subvert the pollution trend. Environment pollution and numerous human ailments can be attributed to poor waste disposal mechanism employed by the individual or various institutions (Lim and Lim, 2014). From land damaging, greenhouse gas emission to release the toxic liquids, organic waste leads to the destruction of the environment. The most common way of disposing of the organic waste is sending waste to landfill. Evidently, 30% of the waste sent to the landfill represents organic waste (Visvanathan, 2011). By managing the organic waste, we can reduce the amount sent to the overburdened landfills hence saving land space. Proper management of the organic waste come in handy in reducing greenhouse gas emission. Organic waste buried in the landfills breaks down releasing the methane gas, one the main greenhouse gasses produced to the environment. Also, the breakdown process releases toxic liquid such as leachate that leads to soil and water pollution (Arvanitoyannis, 2008).
Organic waste management helps in reducing the overall cost of farming and disposing of the waste. Composting the biological waste reduces the need for chemical fertilisers and pesticides as it offers the cheap alternative. Obviously, finished compost is a rich natural fertiliser invaluable in returning nutrient to the soils hence promoting plant growth. Proper waste management lowers the cost of disposal (Visvanathan, 2011). The disposal process involved the collection and transported which can be managed getting rid of the waste as individual household or to engage a localised waste disposal approach (Arvanitoyannis, 2008).
Arguably, SUEZ (formerly SITA) is the leading institutions in the collection and disposing of the organic waste not only in Sydney but also in the large Australia. Other players include Organic Recycling Group (ORG), Covanta Holding Corp, Darling Ingredients and SMT Waste Brokers. Probably, composting is the commonest and cheapest way of getting rid of the organic waste. Edwards et al. (1998) states that materials that are organic in nature such as food scraps, plant material, and paper products are recoverable through composting and decomposing. The resulting organic material could then be reused as manure or mulch for agricultural and landscaping purposes.
The landfill is another approach used to dispose of organic waste in Sydney. However, due to large volumes of waste and scarcity of the landfills, the city has resorted to incineration as a solution for solid organic waste. The combustion involves in the consumption of solid organic waste by converting them into heat, gas and steam, and ash. In Sydney incineration is carried out in large scale by industry by companies Darling Ingredients, Organic Recycling Group (ORG), and SUEZ (Lim and Lim, 2014).
The city could use pyrolysis, integrated bio-digester and Mechanical-Biological Treatment for unsorted organic waste and biofuel gasification in the decomposition of the organic materials. Notably, these approaches involve the use of thermal and chemicals in the decomposition of the organic waste to give more valuable products. The end products of this process include feedstock, charcoal and liquid fuel, manure and heat which can be used by humans.
Arvanitoyannis, I. 2008, Waste management for the food industries, Academic Press, Amsterdam.
Edwards, C.A., Dominguez, J. and Neuhauser, E.F., 1998, Growth and reproduction of Perionyx excavations (Perr.)(Megascolecidae) as factors in organic waste management. Biology and Fertility of Soils, 27(2), pp.155-161.
Golueke, C.G., 1977. Biological reclamation of solid wastes.
InTech – Open Science Open Minds | InTechOpen 2016, Intechopen.com. Viewed 8 June 2016, <http://www.intechopen.com>.
Lim, N., and Lim, N. 2014, 3 Companies Making It Big From Garbage – Australian Ethical – Super and Managed Funds, Australian Ethical – Super and Managed Funds. Viewed 8 June 2016, <https://www.australianethical.com.au/news/trash-treasure-3-companies-making-it-big-garbage/>.
Visvanathan, C. 2011, Decentralized approach to treating the organic fraction of municipal solid waste with energy recovery by using inclined dry anaerobic digestion, Knovel.